Speed+of+Light

toc =Speed of light= Light travels really, really quickly. It travels at approximately 300 000 kilometres every SECOND! Our fastest rockets travel at about 30 000 an hour. __Use a spreadsheet to work out how far light travels in an hour? In a day? In a year? __Post it here.

cameron Greytown
The speed of light is 299, 792, 458 metres per second (check it on google, it's easy to find) So it would mean that it travels 670, 616, 629.4 miles per hour 983, 571, 056.4 feet per second 186, 282, 397 miles per second And finally, 300 000 kilometres every second!thats crazy

Dan (4r]1s]3
Light travels at 299,792,458 meters per second. Thats 1,079,252,848,800 meters an hour Thats 25,902,068,371,200 meters a day Thats 9,454,254,955,488,000 meters a year Thats 9,480,157,023,859,200 on a leap year

Madison,Greytown
Light travels 300,000km a second, so it travels 18,000,000km and hour 432,000,000km a day 1.5768 x10 11

Sophie, Greytown
Light travels at exactly 299,792,458 metres per second. I think thats 1,079,252,848,800 metres per hour.

Josie, Greytown
Light travels 300,000km a second 18,000,000km and hour 432,000,000km a day

=Matthew, Greytown= Light travels at 299, 792, 458 metres per second. thats.... 17,987,547,480 meters per minute and 10,979,252,848,800 meters per hour

Tig (Greytown)
Yep, 300,000 kmps

O.k... WOW that's kinda huge. And I thought fast and furious was... fast

imagine how long it would take for a light-bulb's light rays to hit your eyes when you were standing 2m away!

This distance is called a light-year and is used for measuring the huge distances in space. Kilometres might be quite a long way to walk but they just don’t cut it when measuring distances between stars and galaxies.

Now use your spreadsheet to find out the following: A. It is 150 000 000  kilometres from the sun to Earth – how long does it take the light to travel from the sun to Earth? That is, how long has the sun peeped over the horizon before we see it?

B. Pluto is about 6 000 000 000  kilometres from the sun – how long does it take light to get there? If you were standing on Pluto you would have very cold toes because our sun would look just like a star from way out there.

C. The distance to the nearest star, Proxima Centauri, is 4.2 such light-years. How far is that in kilometres? Using our One Km model where 6 000 000  kilometres is represented by one metre how far away from where we are standing is the nearest star – how close was the prediction you made? Work out how far away that is on a map of Earth.

D. Just to check our ideas about the speed of light. It will travel around the Earth (at ground level) 7.5 times in ONE SECOND! How long does it take sound to travel the same distance (it would have to be a loud bang!)? If we had a motorway with no corners that we could travel at 100 kph without stopping (no petrol!) how long would we be in the car? http://www.lyberty.com/encyc/articles/earth.html __Write your A-D answers here __ A: 50 Seconds